Stability ball roll out exercise works on multiple major muscles while performing on knees. Stability ball roll out works deeply on rectus abdominus muscle, spine, thighs and obliques primarily. Also it strengthens your elbows, arms and shoulders. It is important to keep the spine in neutral position throughout the exercise. Ball roll out exercise is effective for overall strength and stability of core abdominal muscles. It’s a perfect alternative of the classic abs crunch and works on the similar muscles. You should be very cautious while performing the workout to avoid any injury, discomfort or straining the back.